Abstract
Eight 4-yr.-old lab-reared Ss received delayed response problems which were factorial combinations of 3 intertrial intervals (8, 16, and 24 sec.) and 3 intratrial delay intervals (0, 10, and 20 sec.). Errors were directly related to delay duration, but no effect of intertrial interval was measured. Errors were not correlated with general activity during delay intervals, but errors were related to bodily positioning. In a second experiment 6 of the same Ss were given 18-sec. delay trials interrupted by lowering the opaque screen at 1, 6, and 11 sec. for durations of 1, 4, and 7 sec. While both onset time and duration were significant dimensions of screen lowering, only the combination of earliest and longest screen interruption increased errors significantly. Activity increased directly with interruption duration. These results were interpreted as supporting an intratrial performance analysis of the delayed response.
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